与"birth-death ratio"相近的词条

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• birth control rate
• birth control training kit
• birth control treatment
• birth control vaccines
• birth-dath ratio
• birth-death ratio
• birth defect、birth-defect
• birth defect(s)、birth defects
• birth defects monitoring program
• birth difficulty
• birth educater
• birth fracture
• birth grant
• birth history
• birth injuries
• birth injuries of brachial plexus

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